公开(公告)号：US20150381052A1

公开(公告)日：2015-12-31

申请号：US14846389

申请日：2015-09-04

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio ADRAGNA ,  Claudio SPINI ,  Aldo Vittorio NOVELLI ,  Fabrizio BOGNANNI

IPC: H02M3/158

CPC classification number: H02M3/158 ,  H02M3/33507 ,  H02M3/3376 ,  H02M2001/0035 ,  Y02B70/1433 ,  Y02B70/16

Abstract: An effective method enhances energy saving at low load in a resonant converter with a hysteretic control scheme for implementing burst-mode at light load. The method causes a current controlled oscillator of the converter to stop oscillating when a feedback control current of the output voltage of the converter reaches a first threshold value, and introduces a nonlinearity in the functional relation between the frequency of oscillation and said feedback control current or in a derivative of the functional relation, while the control current is between a lower, second threshold value and the first threshold value, such that the frequency of oscillation remains equal or smaller than the frequency of oscillation when the control current is equal to the second threshold value. Several circuital implementations are illustrated, all of simple realization without requiring any costly microcontroller.

Abstract translation: 一种有效的方法，在谐振转换器中，在负载较小的情况下，能够提供低负荷的节能，并采用滞后控制方案，以实现轻载时的突发模式。 当转换器的输出电压的反馈控制电流达到第一阈值时，该方法使转换器的电流控制振荡器停止振荡，并且在振荡频率和所述反馈控制电流之间的功能关系中引入非线性，或 在所述功能关系的导数中，当所述控制电流在第二阈值和所述第一阈值之间时，使得当所述控制电流等于所述第二阈值时，所述振荡频率保持等于或小于所述振荡频率 阈值。 示出了几种电路实现，所有这些都是简单的实现，而不需要任何昂贵的微控制器。